1. DBZ is popular
2. Linkin Park is popular
That alone is enough, but there's more!
1. DBZ is an "angry" anime
2. Linkin Park is "angry" music
But wait, there's even more!
1. DBZ has ANGST!
2. Linkin Park has, quite possibly, TOO MUCH ANGST!
They just go together like chips and salsa! Only a lot more angry and angsty.. and popular!
And then of course, the fans of both that band and that show are mostly early teens, so again, we have a connection. Voila!
And given fanbase similarities between anime and bands go, I am shocked we don't have more boy band/britney spears/christina aguillera etc... and Sailor Moon vids floating around than we do. Cuz the main fanbase for Sailor Moon and those teen idol bands would match up well, too.